Fix p{perl,bash}c shebang on prefix

When I merged the script compilers I forgot to make the Gentoo prefix
ebuild work.
Fix the LIBDIR warning on OSX

It appears that Apple's linker throws a warning message if I pass
-Llib and "lib/" doesn't exist.  This just ensures that the directory
is always created before I attempt to link.

It's not the cleanest solution (as there'll be an empty directory) but
I can live with it for now...
Add "ptest --verbose"

This cats the ptest archive out to stdout on every failure.  The
general idea is that I want to be able to see these failures from my
buildbot so I can figure out what's going on -- sometimes they're not
reproducible regularly.
Bump version to 0.7.4